Materials design data for reduced activation martensitic steel type F82H

Tavassoli, A.A.; Rensman, J.W.; Schirra, M.; Shiba, K.

doi:10.1016/s0920-3796(02)00255-7

Cited by 127 publications

(56 citation statements)

References 4 publications

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“…1, it must be reiterated that to the best of the present authors' knowledge not much data with regard to thermodynamic quantities of high chromiumreduced activation steels are available in the open literature [30][31][32]. In particular, we could not come across any drop calorimetry-based steady-state measurements of thermal quantities on this advanced fusion reactor material.…”

Section: General Pointsmentioning

confidence: 79%

“…4 Comparison of C p of the reduced activation steel (RAFM) estimated in this study from present drop calorimetry enthalpy measurements with the literature data on Eurofer 97 and F82H [30][31][32] a systematic property database on many emerging nuclear structural materials. Thus, two popular reduced activation steel grades, Eurofer 97 and F82H, have been extensively researched in the past and recommendations have already been drawn for their physical and mechanical properties [30][31][32]. The chemical compositions of these two steels are fairly similar (but not identical) to the RAFM steel used in this study.…”

Section: General Pointsmentioning

confidence: 99%

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Drop Calorimetry Studies on 9Cr–1W–0.23V–0.06Ta–0.09C Reduced Activation Steel

et al. 2010

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The temperature dependence of enthalpy increment (H T − H 298 ) of 9 mass% Cr-1 mass% W-0.23 mass% V-0.06 mass% Ta-0.09 mass% C reduced activation steel has been measured by inverse drop calorimetry in the temperature range 400 K to 1273 K. A critical comparison of present isothermal enthalpy measurements with the results of our previous dynamic calorimetry studies has been made to reveal clearly the occurrence of various diffusional phase transformations that occur at high temperature. These phase changes are marked by the presence of distinct inflections or cusps in an overall nonlinear variation of enthalpy values with temperature. The principal thermal relaxation step of the martensitic microstructure obtained through quenching from the high-temperature γ -austenite phase is observed around 793 K. The ferromagnetic-to-paramagnetic transition of the α-ferrite phase is found to occur at 1015 K. The equilibrium values of γ -austenite start (Ae 1 ) and finish (Ae 3 ) temperatures are found to be 1063 K and 1148 K, respectively. A value of 12 J · g −1 has been estimated for • H α→γ the latent heat associated with the α → γ transformation. The measured enthalpy increment variation of the α-ferrite phase with temperature has been fitted to a suitable empirical function to estimate the temperature-dependent values of the specific heat. A comparison of the drop calorimetry-based indirect estimate of the specific heat with the direct differential scanning calorimetry-based values revealed that the drop calorimetry estimates are systematically lower than its dynamic calorimetry counterpart. This difference is attributed to the fact that, under finite heating rate conditions that are typical of dynamic calorimetry, measurements 123 400 Int J Thermophys (2010) 31:399-415 are made under nonequilibrium conditions. Notwithstanding this limitation, there is a good overall agreement between the two C p values and also among the phase transformation temperatures so that a reliable assessment of thermal properties and phase transformation characteristics of reduced activation steel can be determined by a combined analysis of the results of drop and differential scanning calorimetry.

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Section: General Pointsmentioning

confidence: 79%

Section: General Pointsmentioning

confidence: 99%

Drop Calorimetry Studies on 9Cr–1W–0.23V–0.06Ta–0.09C Reduced Activation Steel

et al. 2010

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“…[30] The near-linear variations of (1) rate of acceleration of tertiary creep 'p' with minimum creep rate (Eq. [6]) and with time spent in tertiary regime, i.e., tertiary life (t r À t t ) (Eq. [7]), and (2) final creep rate _ e f with the minimum creep rate _ e m (Eq.…”

Section: B Tertiary Creep Behaviormentioning

confidence: 99%

“…These steels are termed as reduced activation ferritic-martensitic (RAFM) steels which are modified form of grade 91 steel (9Cr-1Mo-0.2V-0.06Nb-0.07N) with the replacement of Mo with W and Nb with Ta and with strict control over radioactive tramp elements (Mo, Nb, B, Cu, Ni, Al, Co, and Ti) and on the elements that promote embrittlement (S, P, As, Sb, Sn, Zr, and O). [1][2][3] The development of such steels is in progress worldwide and given unique name such as Eurofer 97, [4] CLAM steel, [5] F82 H, [6] etc.…”

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confidence: 99%

“…Microstructural evolution in RAFM steels and other similar ferritic-martensitic steels has been studied extensively by many investigators. [3][4][5][6][7][8][9][10][11][12] The M 23 C 6 type of carbides on subgrain boundaries plays an important role in stabilizing the dislocation substructure to increase creep deformation resistance. Effect of tungsten on the stability of the M 23 C 6 and dislocation substructure has been studied by Abe.…”

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confidence: 99%

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Assessment of Tungsten Content on Tertiary Creep Deformation Behavior of Reduced Activation Ferritic–Martensitic Steel

Vanaja

Laha

2015

Metall Mater Trans A

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Tertiary creep deformation behavior of reduced activation ferritic-martensitic (RAFM) steels having different tungsten contents has been assessed. Creep tests were carried out at 823 K (550°C) over a stress range of 180 to 260 MPa on three heats of the RAFM steel (9Cr-W-0.06Ta-0.22V) with tungsten content of 1, 1.4, and 2.0 wt pct. With creep exposure, the steels exhibited minimum in creep rate followed by progressive increase in creep rate until fracture. The minimum creep rate decreased, rupture life increased, and the onset of tertiary stage of creep deformation delayed with the increase in tungsten content. The tertiary creep behavior has been assessed based on the relationship,, considering minimum creep rate (_ e m ) instead of steady-state creep rate. The increase in tungsten content was found to decrease the rate of acceleration of tertiary parameter 'p.' The relationships between (1) tertiary parameter 'p' with minimum creep rate and time spent in tertiary creep deformation and (2) the final creep rate _ e f with minimum creep rate revealed that the same first-order reaction rate theory prevailed in the minimum creep rate as well as throughout the tertiary creep deformation behavior of the steel. A master tertiary creep curve of the steels has been developed. Scanning electron microscopic investigation revealed enhanced coarsening resistance of carbides in the steel on creep exposure with increase in tungsten content. The decrease in tertiary parameter 'p' with tungsten content with the consequent decrease in minimum creep rate and increase in rupture life has been attributed to the enhanced microstructural stability of the steel.

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